Description from the website:
In light of the devastating fire at the Notre Dame de Paris, Ubisoft wants to give all gamers the chance to experience the majesty and beauty of the cathedral through Assassin's Creed Unity on PC.
From April 17th at 15:00 to April 25th at 08:00 (your local time). you can download Assassin's Creed Unity on PC for free here, and you’ll own it forever in your Uplay games library.
In light of the devastating fire at the Notre Dame de Paris, Ubisoft wants to give all gamers the chance to experience the majesty and beauty of the cathedral through Assassin's Creed Unity on PC.
From April 17th at 15:00 to April 25th at 08:00 (your local time). you can download Assassin's Creed Unity on PC for free here, and you’ll own it forever in your Uplay games library.